To paraphrase Hemingway, climate change first comes gradually and then all at once. Now that the negative impacts of changing climate have become undeniable, there is also a dawning realization that—at this point—climate change is unstoppable. This puts into wistful perspective the developing consensus that we should do something about it.

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The most unsettling thing about the accelerating pace of extreme weather events is that they may signal that even as the momentum in the rise of CO2 makes it difficult to ...